* **Breaking Change:** The `parse_pubmed_xml` is replaced by `pmc_article` and `pubmed_article_set`.
* More test coverage
* Pubmed Articles can now parse MathML
* Restructured code to separate out `jats` (pmc open access articles) and `pubmed` (pubmed article set)
* One unit test with 99% coverage
* Added [CHANGELOG.md](CHANGELOG.md)